Tongue exercise device



FIG. 1 is a top, front right side perspective view of a tongue exercise device, showing my new design, the broken lines indicating a tongue and part of a face are shown for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevational view thereof, the rear elevation being a mirror image thereof;

FIG. 3 is a top plan view thereof, the bottom plan being a mirror image thereof; and,

FIG. 4 is a right side elevational view thereof, the left side being a mirror image thereof. 

The ornamental design for a tongue exercise device, as shown and described. 